CVE-2025-1529 identifies a stored cross-site scripting (XSS) vulnerability in the AM LottiePlayer plugin for WordPress, affecting all versions up to and including 3.5.3. The root cause is improper neutralization of input during web page generation (CWE-79), specifically insufficient sanitization and escaping of uploaded Lottie animation files. Authenticated users with Author-level or higher privileges can upload crafted Lottie files containing malicious JavaScript payloads. These scripts are stored persistently and executed in the context of any user who views the affected pages, enabling attackers to perform actions such as session hijacking, credential theft, or unauthorized operations within the victim's browser session. The vulnerability has a CVSS 3.1 base score of 6.4, indicating medium severity, with an attack vector over the network, low complexity, requiring privileges but no user interaction, and impacting confidentiality and integrity with no availability impact. The scope is changed as the vulnerability affects other users beyond the attacker. No public exploits have been reported yet, but the vulnerability is publicly disclosed and should be addressed promptly. The plugin is widely used in WordPress environments that embed Lottie animations, making it a relevant threat for websites relying on this plugin for rich media content.

The impact of this vulnerability is significant for organizations using the AM LottiePlayer plugin on WordPress sites. Successful exploitation allows attackers with Author-level access to inject persistent malicious scripts, which execute in the browsers of site visitors or administrators viewing the compromised pages. This can lead to theft of sensitive information such as authentication cookies, enabling session hijacking, unauthorized actions performed on behalf of users, defacement, or distribution of malware. The integrity of website content and user trust can be compromised, potentially damaging brand reputation. Although availability is not directly affected, the indirect consequences of data breaches or unauthorized access can lead to operational disruptions and regulatory penalties. Since the attack requires authenticated access, insider threats or compromised accounts pose a higher risk. The vulnerability's presence in a popular WordPress plugin increases the attack surface for many organizations worldwide, especially those with collaborative content management workflows involving multiple authors.

To mitigate this vulnerability, organizations should immediately update the AM LottiePlayer plugin to a version that addresses CVE-2025-1529 once available. In the absence of an official patch, administrators should restrict upload permissions to trusted users only, ideally limiting to roles with minimal privileges. Implement additional input validation and output encoding on the server side to sanitize uploaded Lottie files, removing or neutralizing embedded scripts. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious payloads in Lottie file uploads or page content. Regularly audit user roles and permissions to minimize the number of users with Author-level or higher access. Monitor website logs and user activity for unusual behavior indicative of exploitation attempts. Educate content authors about the risks of uploading untrusted files. Finally, consider disabling or replacing the plugin if timely patches are unavailable or if the risk profile is unacceptable.